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Dead Space, Burnout Paradise, Crysis 2, Medal of Honor, Mirror's Edge, Populous or Command & Conquer: Red Alert 3 - Uprising for Audiosurf?
If the games were tradable copies, then maybe. Just be fair, I'm not offering Humble Bundle keys here, so please don't do so as well.
FULL LIST:
Assassin’s Creed® III
AudioSurf
Borderlands 2
Divinity: Dragon Commander
Gun Monkeys
L.A. Noire: The Complete Edition
Skulls of the Shogun
Sleeping Dogs
Super Hexagon
Tomb Raider
Total War: SHOGUN 2
Upgrade Civ V Standard to Gold Edition